...1999 CLIMATOLOGICAL AND SIGNIFICANT WEATHER SUMMARY FOR MCKELLAR REGIONAL AIRPORT IN JACKSON TENNESSEE...
1999 WILL GO DOWN IN THE RECORD BOOKS AS A WARMER THAN
AVERAGE YEAR...THOUGH THERE WERE SEVERAL MONTHS SLIGHTLY COOLER THAN NORMAL...MAINLY
DUE TO COLD OVERNIGHT TEMPERATURES. 7 MONTHS WERE ABOVE NORMAL...
WHILE 5 WERE BELOW NORMAL. PRECIPITATION WAS WELL BELOW
NORMAL IN ALL BUT THREE MONTHS...WITH A WET JANUARY BUT A BONE DRY SUMMER.
BELOW IS A TABLE OF EACH MONTHS AVERAGE TEMP AND PRECIP:
| MONTH | AVGTEMP | DEPARTURE | RAINFALL | DEPARTURE | RAINDAYS |
| JANUARY | 42.6 | +5.7 | 7.41 | +3.47 | 13 |
| FEBRUARY | 46.9 | +5.3 | 1.58 | -2.81 | 9 |
| MARCH | 45.8 | -5.4 | 3.95 | -1.07 | 13 |
| APRIL | 63.4 | +2.5 | 5.09 | -0.27 | 12 |
| MAY | 67.1 | -1.8 | 3.87 | -1.57 | 12 |
| JUNE | 76.8 | +0.1 | 4.27 | +0.12 | 10 |
| JULY | 81.5 | +1.3 | 2.48 | -1.94 | 4 |
| AUGUST | 78.5 | -0.1 | 0.78 | -2.30 | 3 |
| SEPTEMBER | 70.9 | -1.3 | 0.42 | -3.33 | 3 |
| OCTOBER | 60.2 | -0.8 | 3.43 | +0.37 | 4 |
| NOVEMBER | 53.8 | +3.2 | 3.59 | -1.20 | 6 |
| DECEMBER | 43.0 | +1.9 | 5.01 | -0.37 | 8 |
| YEARLY | 60.9 | +0.9 | 41.88 | -11.33 | 97 |
THE WIDE RANGE OF TEMPERATURES AND CONDITIONS IN ANY GIVEN YEAR OFTEN LEADS TO RECORDS BEING SET OR TIED. BELOW IS A LIST OF RECORDS SET OR TIED (DOES NOT INCLUDE COOLEST HIGHS OR WARMEST LOWS) IN 1999. KEEP IN MIND THAT RECORDS AT JACKSON DATE BACK ONLY ABOUT 60 YEARS COMPARED TO 100 YEARS AT OTHER SITES:
FEB 10...TIE RECORD HIGH...73 DEGREES
FEB 11...NEW RECORD HIGH...76 DEGREES
JUN 18...NEW RECORD LOW....53 DEGREES
JUL 30...NEW RECORD HIGH..101 DEGREES
AUG 01...NEW RECORD HIGH...99 DEGREES
AUG 11...NEW RECORD HIGH..100 DEGREES
AUG 12...NEW RECORD HIGH..100 DEGREES
AUG 31...NEW RECORD LOW....52 DEGREES...PREVIOUS RECORD
53 SET IN 1988
SEP 10...NEW RECORD LOW....48 DEGREES...PREVIOUS RECORD
49 SET IN 1998
SEP 17...NEW RECORD LOW....43 DEGREES...PREVIOUS RECORD
47 SET IN 1981
SEP 23...NEW RECORD LOW....38 DEGREES...PREVIOUS RECORD
41 SET IN 1995
OCT 20...TIE RECORD LOW....32 DEGREES...PREVIOUS RECORD
32 SET IN 1989
NOV 07...NEW RECORD HIGH...79 DEGREES...PREVIOUS RECORD
78 SET IN 1980
NOV 09...TIE RECORD HIGH...76 DEGREES...PREVIOUS RECORD
76 SET IN 1954
(NOTE: YEAR OF PREVIOUS RECORD NOT AVAILABLE UNTIL AUGUST
1999.)
...OTHER SIGNIFICANT WEATHER INFORMATION...
IN ADDITION...FOUR 'COLDEST HIGHS' AND FOUR 'WARMEST LOWS' WERE TIED OR SET IN 1999. THE MOST SIGNIFICANT WEATHER EVENT IN JACKSON DURING 1999 WAS THE TORNADO EVENT OF JANUARY 17TH. MORE THAN HALF A DOZEN PEOPLE DIED AND OVER ONE HUNDRED WERE INJURED IN THE SEVERE WEATHER EVENT WHICH DROPPED MANY TORNADOES AND CAUSED EXTENSIVE DAMAGE THROUGHOUT WESTERN TENNESSEE. AFTER THE JANUARY EVENT...THE BIG STORY OF 1999 WOULD BECOME THE DRY WEATHER WHICH SPARKED MANY BRUSH FIRES DURING THE SUMMER.
MISCELLANEOUS CLIMATOLOGICAL INFORMATION FOR JACKSON:
| PARAMETER MEASURED | 1999 | NORMAL | DEPARTURE |
| AVERAGE HIGH | 72.7 | 70.9 | +1.8 |
| AVERAGE LOW | 49.0 | 49.2 | -0.2 |
| HIGHEST TEMPERATURE | 101 ON 7/30 | ||
| LOWEST TEMPERATURE | 5 ON 1/ 5 | ||
| DAYS LOW 32 OR LESS | 67 DAYS | 73 DAYS | - 6 DAYS |
| DAYS HIGH 90 OR MORE | 69 DAYS | 61 DAYS | + 8 DAYS |
| DAYS HIGH 100 OR MORE | 4 DAYS | 3 DAYS | + 1 DAY |
| LAST FREEZE (SPRING) | 3/28 | 4/03 | + 6 DAYS |
| FIRST FREEZE (FALL) | 10/20 | 10/29 | + 9 DAYS |
| GROWING SEASON | 206 DAYS | 209 DAYS | - 3 DAYS |
| HEATING DEGREE DAYS | 3146 | 3531 | -385 |
| COOLING DEGREE DAYS | 1747 | 1744 | + 3 |
| GREATEST 24 HR RAIN | 3.24 ON 1/22 |